The Bosch GMS120-27 Wall Scanner provides quick, easy, and accurate detection of wood and steel studs, metals, and live wires behind drywall. Power flexibility helps keep the scanner up and running on the job with the option to use with the included two AA Batteries or 3.7V Li-Ion battery (sold separately). Get clear, confident results with the intuitive user interface that displays object center indication and material identification. Easy to use, the device glides smoothly across the wall and the color-coded illuminated marking ring makes fast, accurate work of transferring detection results. IP54 rating and shock-absorbing rubber casing help provide added durability on tough jobsites. EASY-TO-USE: This device glides smoothly across the wall. The color-coded illuminated marking ring makes fast, accurate work of seeing inside your wall. The marking hole allows you to quickly transfer detection results. The audible detection signal, which can be turned on and off, allows for quick detection when speed matters. EASY-TO-READ: The large, bright LED screen allows you to easily read the intuitive user interface display. It relays object center, wall depth, and material identification, helping you easily locate and identify studs, rebar, pipes, wiring, or almost anything else behind your walls, floors, and ceilings. DURABLE: IP54 rating and shock-absorbing rubber casing provide peace of mind on tough jobsites. QUALITY ACCURACY: This professional grade scanner offers the peformance and accuracy that has come to be expected from the Bosch Professional brand.